DE1273069B - Flat electromagnetic relay - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Ci .:

HOIh

German class: 21g-4/01

Number: 1273 069

File number: P 12 73 069.7-33 (G 35950)

Filing date: September 19, 1962

Opening day: July 18, 1968

The invention relates to an electromagnetic relay in which the movement of the armature is not in Direction of the coil axis takes place, but in which the working air gap in an approximate to the coil axis parallel plane, so that the elongated, hinged at one end of the core anchor moved approximately perpendicular to the coil axis, a so-called electromagnetic flat relay.

It is known to attach a component made of insulating material to each of the relay core ends, one of which the connection ends of the fixed contact springs, while the other holds the free ends of these contact springs and at the same time carries a bracket for the fallen end of the anchor. The mating contacts are fixed, however, so that the contact pressure is solely due to the spring action of the movable Contacts is conditioned. This requires careful adjustment of the finished relay, especially one Reinforcement of the contact pressure by bending the moving contact strip in one direction Reduction of the contact pressure after switching to the mating contact causes.

In another relay, the fixed and movable contacts are provided with notches comb-like isolating organs have been held and guided. Here, too, the contact pressure and the exact starting position of the contacts solely by adjusting the resilient contact strips certainly.

It is also no longer new, in a flat relay still another insulating part in addition to that Provide contact operating member, which serves to support the fixed contact springs.

Likewise, in another known embodiment, the fixed contacts are already included separate compression springs have been pressed into their rest position.

These known relays are relatively expensive to manufacture. This is particularly due to the adjustment of the assembled relays, so that they achieve the prescribed values with the intended operating values Perform functions. Usually each relay contact and each additional Armature preload can be adjusted to the appropriate gear of the contacts and after assembly ensure the correct anchor loading pressures. The air gaps of the relay must also be and adjusted in the working state so that the movement of the relay armature appropriately the actuated different contact springs.

The object of the invention is to reduce these costs caused by the adjustment.

Flat electromagnetic relay

Applicant:

General Signal Corporation, Rochester, N.Y.

(V. St. A.)

Representative:

Dr.-Ing. Ä. van der Werth

and Dr. F. Lederer, patent attorneys,

2100 Hamburg 90, Wilstorfer Str. 32

Named as inventor:

Wheeler Dean Maynard, Mendon, N.Y.

(V. St. A.)

Claimed priority:
V. St. v. America October 2, 1961
(142 391)

According to the invention, this is achieved with an electromagnetic flat relay in which the armature at one end of the core of the excitation coil in an insulating material, which is also used to hold the Serves contact springs, is rotatably attached and at the other end of the core with which the armature cooperates, a further insulating material is fixedly arranged, which has at least one opening, through which the free ends of a contact spring set protrude and in the stop surfaces are available on which the fixed contact spring strips in the non-actuated state by means of additional Compression springs rest pre-tensioned, and this is characterized in that the force of each Compression spring on the associated contact spring strip is essentially constant in all positions of the armature is.

In a preferred embodiment, the relay has one attached to the free end of the armature movable card and a multitude of contact strips on, some of which are movable Card can be worn to selectively according to the operating position of the anchor with the not of the movable card carried contact strips in loading

809 570/418

3 4

to be moved. Next are a front are brought. These cast or injected Insulating body with precisely incorporated surface blocks 11 and 12 are made of suitable insulating material, share to determine the location of the outstanding z. B. Lexan resin or another synthetic resin,

End of the core, the release position of the anchor made.

and the free position of the non-movable 5 The winding arrangement is on the core 10 on card worn contact strips and still resilient strengthens and contains two excitation windings 14, which on Means are provided to apply the armature to its adjacent bobbins 15.

Discharge position and those not of the movable When the windings 14 are energized, they cause

Card worn contact strips against their relate to the actuation of the relay, which is described in more detail below

permanently pretensioning the free layers. io is described.

Furthermore, the resilient means can essentially The field windings 14 are at their connections

borrowed in the direction of the working air gap between provided with brackets 16, which have approaches 17 of the

be arranged the core and the anchor. Terminal plates 18 fit as shown in FIG.

The resilient means preferably consist of these connecting plates 18 when they are put together Compression springs, which are removable or replaceable, are built in suitable slots in the upper surface construction placed on surfaces of the insulating piece of the block 11 and in the lower surface of the block, that the position-determining surface parts kes 12 are formed (see. Fig. 6 and 8), applied. brought and through overlying insulators 19 therein

It has been proven that the working air gap is held between the tubular lugs 20,

see the core and the anchor a cross-section 20 with the cylindrically countersunk openings 21 in the

has area that fit together large in relation to its blocks 11 and 12, as shown in FIG. 2

Length is. is clearly shown.

An exemplary embodiment of an inven- From FIG. 6 it can be seen that non-linear compensation according to the invention electromagnetic flat relay is standing elements 22 against the bottom of the upper explained on the basis of the drawings. It represents 25 connecting plates 18 formed by helical springs 23

Fig. 1 is the front view of a relay after the pushes, the lower ends of which on the assigned

Invention which, partly in section, rest the constructive lower connecting plates. This arrangement

Special features of the relay illustrated, voltage serves to suppress overvoltages

F i g. 2 shows a section along the line 2-2 in FIG. 1, between the relevant connection plates 18 to

viewed in the direction of the arrows representing the general 30 arcing between not shown

Structure of the relay illustrates the contacts that can be switched on and limit

F i g. 3 shows a section along the line 3-3 in FIG. 1, turn off the relay windings 14 are used. Seen in the direction of the arrows, the general example, the resistance elements 22 Shape of the relay core structure illustrated, be disc-shaped and from the known

F i g. 4 is a partial view of a section along the 35 th thyrite, the line with low operating chip 4-4 in Fig. 3, seen in the direction of the arrows, has a high resistance value at which illustrates how the relay armature at the rear has higher voltages but a low resistance core is rotatably mounted, standing value, so that strong arcing

F i g. 5 the rear view of the relay, when the windings are switched on or switched off

F i g. 6 is a partial view of a section along which 40 14 can be avoided.

Line 6-6 in Fig. 5, viewed in the direction of the arrows. With regard to Figs. 3 and 6, it should be noted

the provided on the relay means for light that the springs 23 through holes in the

Arch suppression illustrates blocks 11 and 12 that they extend opposite

F i g. 7 is a view of a partial section along which the relay core 10 is electrically isolated.

Line 7-7 in Fig. 5, seen in the direction of the arrows, 45 The blocks 11 and 12 are further connected with

which is provided with recesses matching the fastening of the relay contact strips, as shown in FIG

clearly, and show 3, which receive a bolt 24, the

F i g. 8 shows a section along line 8-8 in FIG. 5, is used to suitably connect the relay to a

seen in the direction of the arrows to fasten the fastening relay frame, not shown. This

the connection plates for the relay coil are shown against rotation in the blocks 11

light, and 12 secured by a U-shaped component 25,

Fig. 9 is an oblique view of the insulator piece, which is in the associated recesses of the

used in the relay to insert the extended blocks 11 and 12 during assembly

Contact strip becomes in the correct parallel position,

hold, 55 on blocks 11 and 12 are - by suitable-

10 shows a graphical representation of the stressed insulating layers 19 separated from one another - and pull-in curves for a relay according to the invention a plurality of contact springs each in groups angeordin Comparison with the corresponding load net. Each group contains a movable contact and tightening curves of conventional previously manufactured strips 26, the fixed between them Relay. 60 contact strips 27 and 28 is attached and of The relay has a flat, generally rectangular shape due to insulators 19 in between, magnetic core 10 with an inseparable. Preferably the different ones are con regular cut-out part on its fastening tact strips 26, 27 and 28 in slots intended for this purpose th right end as shown in FIG. Inserted into this (see FIG. 9), with which the insulator 19 ver-ends of the core 10 are drilled two holes, which can be seen 65, these insulators in the desired tubular extensions 13 in the preferably stacked manner by means of the drilled injected or cast blocks 11 and 12 receiving holes 21, which the associated matching pipe shapes, the lugs 20 of the overlying insulator part, which are pleasant above and below the core 10

19 record, be arranged. The outer insulators 19 have angular depressions that together with rivets 30 firmly press the arrangement together and in the stacked state hold on, as shown in FIG. 2 is shown.

So that the contact strips in the longitudinal direction of the relay in the desired exactly parallel setting The insulator plates 19 (see FIG. 9) are shaped in this way during manufacture - e.g. B. by pressing or spraying - that they contain resilient lugs 31 which fit into the slots for the contact strips intervention. If the contact strips are attached to the contact slots (e.g. the Contact strip 26 in FIG. 9), the resilient lugs 31 of the insulator 19 cause each of the contact strips 26, 27, 28 always firmly against the precisely dimensionally designed and grooved side walls

31 α of the contact slots in the insulating bodies 19 is pressed. Tongue and groove forming slots 31 b in the contact strips and projections 31 c in the contact slots ensure the correct position of the contact strips in the longitudinal direction, as shown in FIGS. 7 and 9 can be seen.

An anchor 32 is rotatably attached to the irregularly cut portion of the core 10 such that it rests on the upper surfaces 33 of the core 10, as shown in FIG. 4 shows. The armature 32 is substantially L-shaped, and its shorter leg 34 is pressed against the upper transverse edge 34 a of the cut-out part of the relay core 10 by a spring 35 (see. Fig. 3), which is compressed between a spring seat 36 on the downwardly extending part of the block 11 and a spring seat 38 which is mounted in a rectangular cavity 39 in the short leg 34 of the armature 32. The downwardly extending part 37 protrudes through the cut-out part of the core 10 and holds the armature 32 in the assembled state within the cut-out part of the core 12. As can be seen in FIG. 2, the helical spring 35 is substantially in line with it the rotating transverse edge 34 a of the core 10 attached, whereby the desired rotation of the armature

32 guaranteed and at the same time the anchor is held under prestress against this edge 34 α, so that no undesirable air gap occurs.

As the figures show, the movable contact strips 26 extend a little further to the left than each of the upper and lower contact strips and operate with a movable card 40 of suitable insulating material together carried by the protruding free ends of the armature 32 will.

Like the fig. 1 and 3 can be seen, the movable card on the anchor 32 and in appropriate Cooperation with the movable contact strip 26 attached in that first the Card 40 is pushed over the left ends of the movable contact strips 26 and the anchor 32, whereupon the card is pushed to the right (see FIG. 1) so that the movable card 40 is slotted into slots 41 slides (see FIG. 3), which are attached to the left ends of the movable contact strips 26. the Card 40 is then in this assembled position by a resilient lug 42 on the card 40 held, which cooperates with an opening 43 in the armature 32. The movable card 40 is also provided with protruding pockets 40 α (see FIG. F i g. 2 and 3), which may be labeled with a Cards (not shown) to identify the relay can accommodate.

A holding block 44 made of suitable insulating material, preferably produced by injection molding or pressing, ζ. B. from injected Lexan resin, is arranged on the contact side of the relay and with a Provided a variety of precisely and dimensionally designed surfaces through which the rest positions of the front and rear contact strips 27 and 28, the starting position of the relay armature 32 and the position of the free end of the relay core can be set against each other exactly.

In particular, the side edges of the core 10 near this end are cut as it is through reference number 45 in FIG. 3 is specified. The core 10 is against matching shoulders 46 (Fig. 1), which were attached to the front block 44 during manufacture, clamped by a leaf spring 47, their outstretched ends rest on shoulders 48 in block 44 and their curved portion on the relay core 10 gives a firm downward bias against the shoulder 46.

When the core 10 is attached in the manner described, the assembled structure is of the reel building exactly between the front block 44 and the rear blocks 11 and 12. Next, as already mentioned, the front block 44 with z. B. web-shaped or frame-shaped formed surfaces 49 and 50 are provided, which in turn are the rest positions of the front and rear contact strips 27 and 28 set; in addition, a surface 51 is provided in the front block 44, which the The starting position of the relay armature 32 is defined.

Because the mutual positions of the cooperating relay parts are all previously determined are, no adjustments are required after assembly, as is the case with the previously manufactured Relay is the case.

From Fig. 2 it can be seen that a coil spring 52 with a low spring rate - during of assembly compressed and between a spring seat 53 on surface 54 of the front block 44 and a spring seat 55 on the surface of the relay armature 32 is used. This spring 52 is used to give the armature 32 a permanent bias in the direction of the rest position give, in which its underside rests firmly on the surfaces 51 on the front block 44. In a similar way coil springs 56 and 57 with low spring rates are compressed during assembly and between suitable spring seats 58 on faces 59, 60, 61 and 62 of the front block 44 and similar spring seats 63 are used on the contact strips 27 and 28 to keep them permanently in Bias towards their rest position, in which they on the surfaces 49 and 50 of the front block 44 rest. As mentioned, the coil springs 52, 56 and 57 have low spring constants, and by the compression of these springs during assembly will create the desired loading pressures exercised steadily. Furthermore, these spring pressures remain essentially constant when the relay contact strips are 27 and 28 and the relay armature 32 move as the amount of spring deflection during the Relay actuation is small compared to the deformation when inserting the spring into the intended Job. As a result, it is not necessary to

7 8

The fixed contact strips are essential after assembly to maintain reliable contact desired to adjust loading pressures, like the 27 and 28 divided at their free ends like a fork, is normally the case with the known relays. Like Fi g. 2 shows is a thin, precisely sized If the windings 14 are not energized, plate 64 will be made of suitable non-magnetic material the relay armature 32 in its normal direction on the top of the free relay armature 32 starting position held by the coil spring 52 that brought the air gap of the relay, in particular their predetermined spring pressure continuously after in the tightened state, fills. Lower plate 64 exerts on the armature 32, thereby preventing the armature from being in its tightened position with respect to the surface 51 of the front block 44 position under the effect of residual magnetism. In this position is the moving io.

When the relay windings 14 are de-energized, the action of the movable contact strips 26 interacts with the combined loading pressures of the others exerted by the springs 56 and the fixed contact strip 28 in 52 them push them away from their rest position, as determined by the ker 32 in its off-surfaces 50 shown in the drawing. In this 15 starting position, in which it rests on the surface 51 of the operating state, the helical springs 57 for the front block 44 and in which the movable contact strips 26 see the desired required contact pressure to interact with the movable contact strips 26 and the fixed contact strips 28 are brought,
solid contact strip 28. Furthermore, referring to FIG. 1 and 2 it is to be noted that the co-operation with the helical spring 52 is noted that the soft helical springs 52, 56 and 57 create the desired armature loading pressure when the essentially perpendicularly aligned with the working armature is in its starting position. Are attached to the air gap of the relay. As a result of Fig. 2 it can be seen that the fixed contact determine the various previously established strips 27 in their rest position against the associated pressures exerted by these helical springs 56 are pressed when the armature is also the operating values of the relay. Next these are falling is. When the relay windings 14 are energized, they are interchangeably fitted so that coil springs on the armature 32 can be inserted against the underside of the relay core 10 of various values when it is energized. The path of the armature 32 is precisely fixed - it is desired to change the operating values of the relay by changing the distance between the armature rest position.

the free end of the relay core 10. The working thus with the invention a slightly combined air gap compared to its length a settable relay can be obtained in which only a relatively large cross-sectional area, whereby all single set of rivets for assembly require relatively quick changes The magnetic different 35 is different and in which all mutual positions of the tensile force due to the excitation of the windings 14 different relay parts are reduced by a block determined on the armature 32 during its movement. Similar or identical Redert can therefore be used (cf. tightening curve B in FIG. 10). The movable card 40 shifts the movable ones in a simple manner, and since their contact strips 27 in the upward direction, v / o through the 40 parts, have exactly the same position, no contact between the movable contact strips 26 is individual adjustment with each individual one of the subsequent and the fixed contact strips 27 canceled and relays produced to one another are required,
The contact between the movable contact strips is made by the use of coil springs with fen 26 and the fixed contact strips 27 with a low spring constant for the anchor load. From the drawings and the preceding 45 pressures, which essentially result from the operation of the relay description, that a good electrical remain constant, it is also not necessary to adjust the contact between the movable contact springs 26 to individual armature load pressures,
In Fig. 10 the curve shows a typical quake springs 57 is obtained until the load curve and curve B shows a typical tightening tact strip 28 on the surfaces 50 in the front block 50 for the relay described , the curves C 44 are present. and D , on the other hand, show typical load and on-As soon as the movable contact strips 26 follow the pulling curves of conventional relays produced up to now. Detect from fixed contact strips 27, these are shown by the load curve A , it can be seen that the anchors of the associated surfaces 49 of the front block lifted load pressures during the switching of the relay 44 and cause further contact 55 to remain essentially constant (in particular pressure of the associated coil springs 56. Again in comparison to the load curve C). As has already been mentioned in the following, with these screws a relay according to the invention has only a small degree of change, since it is moderately insensitive to all small deviations in the value of the pressed which occur during assembly during assembly, and consequently the pressure is the 60 contact pressure. It should also be pointed out that springs 56 are directly effective to a suitable the tightening curve B (especially compared with the electrical contact between the movable Kon-tightening curve D) shows only relatively small Abweitaktstreifen 26 and the fixed contact strip 27 chungen, so that the relay according to the invention to ensure. In addition, the pressure exerted remains relatively insensitive to the helical springs 56 for the above reasons, in the minor deviations that occur during manufacture, constant at the value to which the pressure in the armature travel and especially to the down helical springs 56 due to compression when the air gap softens is. Consequently, such assemblies can be adjusted. For the purpose of low production-related tolerances, the

Do not change the operating values of the relay to any noticeable extent.

It can also be seen from FIG. 10 that the relay constructed according to the invention has a relatively large difference between the pull-in curve B and the load curve A when the armature 32 has fallen completely. As a result, the relay has very desirable acceleration properties, which are necessary for the relay to operate quickly. Furthermore, the difference between the tightening curve B and the load curve A is relatively small when the armature 32 is fully tightened. As a result, the bouncing of the contacts when the relay is working is reduced.

Claims (5)

Patent claims: 1. Electromagnetic flat relay, in which the armature is at one end of the core of the excitation coil rotatably fastened in an insulating material that also serves to hold the contact springs and the one at the other end of the core that the anchor is working with further insulating material is fixedly arranged, which has at least one opening through which the free ends of a contact spring set protrude and are present in the stop surfaces are on which the fixed contact spring strips in the non-actuated state by means of additional Compression springs rest preloaded, characterized in that the force each compression spring (56, 57) on the associated contact spring strip (27, 28) in all positions of the armature (32) is essentially constant. 2. Electromagnetic flat relay according to claim 1, characterized by one on the movable card (40) attached to the free end of the anchor (32) by a plurality of contact strips (26-28), some of which are carried by the movable card (40) to selectively move according to the operating position of the anchor (32) in contact with the contact strips (27, 28) not carried by the movable card (40) are brought, further through a front holding body (44) made of insulating material with exactly incorporated surface parts (46, 49 to 51) to determine the position of the protruding End of the core (10), the release position of the anchor (32) and the free position of the not of contact strips (27, 28) carried by the movable card (40), and further by resilient means (52) for the permanent bias of the armature (32) against its release position and the contact strips (27, 28) not carried by the movable card (40) against their respective ones free locations. 3. Electromagnetic flat relay according to claim 1 or 2, characterized in that the resilient means (52, 56, 57) essentially in the direction of the working air gap between the Core (10) and the anchor (32) are arranged. 4. Electromagnetic flat relay according to the preceding claims, characterized in that that the resilient means (52, 56, 57) consist of individual compression springs (52, 56, 57), which are removably or exchangeably arranged on surfaces (53, 58 to 62) of the insulating piece (44) are, which carries the position-determining surface parts (46, 49 to 51). 5. Electromagnetic flat relay according to the preceding claims, characterized in that that the working air gap between the core (10) and the armature (32) has a cross-sectional area which is large in relation to his Length is. Considered publications:
German Patent No. 923 370;
Swiss Patent No. 329 893;
French Patent No. 945 403;
U.S. Patent No. 2541 355. For this purpose \ sheet drawings 809 570/418 7.68 © Bundesdruckerei Berlin